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authorRoland McGrath <roland@hack.frob.com>2011-07-14 19:09:27 -0700
committerRoland McGrath <roland@hack.frob.com>2011-07-14 19:09:27 -0700
commit9fa2c03227e159050e9dc4ec1e315e5909901580 (patch)
tree88b205ce926259885826bd312cfbc3514546cb57 /configure.in
parentdefe906180bad4e356bb55b60b10abd41b7ee3a1 (diff)
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Adjust relro test to work around GNU ld limitations.
Diffstat (limited to 'configure.in')
-rw-r--r--configure.in7
1 files changed, 7 insertions, 0 deletions
diff --git a/configure.in b/configure.in
index d40bc64ca2..55e56498c1 100644
--- a/configure.in
+++ b/configure.in
@@ -1607,7 +1607,14 @@ EOF
AC_LANG_CONFTEST([AC_LANG_SOURCE([[
int _start (void) { return 42; }
extern void _exit (int);
+/* Since these pointers are const, they should go in rodata.
+ Since they refer to functions that have to be resolved by
+ dynamic linking, they should instead go in RELRO data. */
const void *const relro[] = { &_start, &_exit, 0 };
+/* GNU ld fails to produce RELRO data when it's very small and there is no
+ normal writable data following it, or if only uninitialized (.bss) data
+ follows it, or only very small writable data. */
+int data[0x10000] = { 1, };
]])])
cat > conftest.awk <<\EOF
BEGIN {